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The radials are short in the median line, but extend upward in the angles of the calyx 
where they form a broad process with parallel sides and a straight or convex distal border 
which entirely and widely separates the bases of the IBr^. In width this anterior process from 
the radials is equal to about one half of the length of the ventrolateral edge of the IBrj. 
The IBrj are oblong, nearly or quite three times as broad as long, with the ventro- 
lateral edge produced into a thin flange-like border with a smooth outer edge which is about 
twice as wide proximally as distally; the proximal end is even with the edge of the interradial 
process. The IBr^ (axillaries) are broadly pentagonal, not quite twice as broad as long; the 
dorsal surface is slightly excavated so that the distal borders appear prominent; the thin 
produced ventrolateral edge of the IBtj is continued on to the I Br, where, viewed ventrally it 
is seen to have its sides parallel, while viewed dorsally it disappears under the lateral angles 
of the axillary. The IIBr series are 2. At each synarthry there is a high and prominent tubercle 
which in height is approximately equal to the longer (longitudinal) diameter of its base. These 
synarthrial tubercles recall those of Perometra diomedeae , but they are proportionately narrower 
and more slender than those of that species, though nearly as high. The IBr^ sometimes has 
a small rounded tubercle just anterior to the proximal half of the .synarthrial tubercle; the IBr 
axillary has a more or less prominent narrow rounded median carination running anteriorly 
from the base of the distal half of the synarthrial tubercle, often terminating, approximately on 
a level with the lateral angles, in a prominent tubercle; these are repeated on the ossicles of 
the IIBr series and on the first two brachials. 
The arms are 16 or 17 in number in fully grown examples, about 70 mm. long. The 
brachials are essentially like those of Xeometra multicolor^ but each bears a prominent low 
narrow rounded carination which ends distally in a more or less spinous production of the 
\ distal edge; this carination lies on the oppo.site side of succeeding brachials, especially in the 
proximal portion of the arm. 
Pj is 10 mm. long, slender and weak, composed of 28 — })}, segments of which the first 
two are enormously enlarged and the remainder very small and about as long as broad ; the 
first segment is irregularly rounded wedge-shaped, about two and one half times as broad as 
long, about as broad as the lateral diameter of the brachial which bears it; the distal portion 
of the segment consists of a broad rounded carinate process about as high as the maximum 
diameter of the ossicle; the second segment is about three fifths as broad as the first, and 
narrow, between four and five times as broad as the ma.ximum (distal) length ; the distal border 
is strongly rounded ; the third segment is about as long as broad, and occupies the median 
third of the distal margin of the second. P., is long, stiff and spine-like, though rather slender, 
13 mm. to 15 mm. long, with 18 — 22 segments of which the first is much enlarged with a 
high evenly rounded distal process, the second is smaller, trapezoidal, about twice as broad as 
long with a carinate process having a straight instead of a rounded distal border, the third is 
slightly longer than broad with a small more or less irregular carinate process usually occupying 
only a portion of the distal edge ; the first segment is not .so large as the first segment of Pp 
and the second is longer than the corresponding segment of Pj ; the third segment is about 
half as broad as the second ; after the third the segments increase in length so that the sixth 
